iOS 将图片保存到本地

//将图片保存到本地
+ ( void )SaveImageToLocal:(UIImage*)image Keys:( NSString *)key {
    NSUserDefaults * preferences = [ NSUserDefaults standardUserDefaults];
    //[preferences persistentDomainForName:LocalPath];
    [preferences setObject:UIImagePNGRepresentation(image) forKey:key];
}

//本地是否有相关图片
+ ( BOOL )LocalHaveImage:( NSString *)key {
    NSUserDefaults * preferences = [ NSUserDefaults standardUserDefaults];
    //[preferences persistentDomainForName:LocalPath];
    NSData * imageData = [preferences objectForKey:key];
    if (imageData) {
        return YES ;
    }
    return NO ;
}

//从本地获取图片
+ (UIImage*)GetImageFromLocal:( NSString *)key {
    NSUserDefaults * preferences = [ NSUserDefaults standardUserDefaults];
    //[preferences persistentDomainForName:LocalPath];
    NSData * imageData = [preferences objectForKey:key];
    UIImage* image;
    if (imageData) {
        image = [UIImage imageWithData:imageData];
    }
    else {
        NSLog (@ "未从本地获得图片" );
    }
    return image;
}